I've been playing RollerCoaster Tycoon since the first day it came out so I'm not new to the game itself but what I am new to is downloading someone elses creations and trying to use them in my own parks. I've followed all the correct steps in downloading the files, extracting them if needed, and even placing them but still I seem to have came to a dead end. I have downloaded about 11 different tracks now and have placed them in the Documents/RCT3/Coasters folder and go into the game and the coaster is in the correct folder and the name appears but when I go to build it I get a message that says "No Object In File". I have read forums on here stating that it might be the file it self so I tried the same process with the newest tracks uploaded compatible with what version of RCT3 I am using with the same problem. I have tried searching forums for help but can't seem to find a solution. The same goes for the custom parks..except I place those in my Documents/RCT3/Parks folder and when I go into Sandbox mode to open them they are there except when I do open them all that shows up is what appears to be dirt. Maybe someone can help me as I have no clue what do..
I am using RCT3 with no expansions on Windows 7.
Thanks in advance!

To clarify do you have RCT3 with Soaked and Wild? It doesn't sound like you do from what you stated. If you don't have those "expansions" you may not be able to use what you are downloading correctly. If you can provide me with the specific parks, tracks etc you are trying to use, I can try and help you more. You might want to read and try this, but make a back up of your computer projects before you do anything please.
This is from the Frontier website (they have a few different sections and versions, so please read through everything before installing anything)
Installing RCT3, Expansions and Updates
https://forums.frontier.co.uk/showthread.php?t=3